Why can't I find the function decomposition?

https://www.mathworks.com/help/matlab/ref/decomposition.html Here I found that there is a matlab function "decomposition". However, when I tried to use it in my matlab it couldn't find this function. Is there a toolbox for it?

[Kevin Holly]

Are you using MATLAB R2017b or greater?

[Bikash Dey]

I'm using R2017a. But in that page there is no mention of removing this function from the later versions.

[Bikash Dey]

I think I figured the problem. I need R2017b or greater. Thanks for the help. I just noticed R2018a in the header line of the page with decomposition.